[Fot] Collective wisdom

[Tony Drews]

I'm not saying it's a good idea or a bad idea, but just be aware that 
the water in the head (and block) is at a higher pressure than the water 
in the radiator.  If you have, say, a 12 psi cap on the header tank and 
it's plumbed to the head it may overflow.

We discovered that on Jack's car when he put a radiator cap on top of 
the thermostat housing so he could fill from the high point.  We ended 
up blocking off the overflow there and just using the one on the 
radiator itself for that purpose.  The radiator cap on the t-stat 
housing made filling the car with water a breeze after that.

Cheers, Tony Drews

On 1/20/2026 3:19 PM, Michael Moore via Fot wrote:
>
> Chuck, I have mine plumbed the way you mentioned, it really helped 
> with my overheating, then added a new radiator last year and now I 
> have no problems.
>
> Have a Good Day
>
> Mike
>
> Michael T. Moore, CPA
>
> 3255 West 26^th Street
>
> Erie, PA 16506
>
> Phone: 814-616-8652  ext 100
>
> Fax: 888-865-5279
>
> Email: mmoore at mtmcpafirm.com <mailto:mmoore at mtmcpafirm.com>
>
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> *From:*Fot <fot-bounces at autox.team.net> *On Behalf Of *Chuck Gee via Fot
> *Sent:* Tuesday, January 20, 2026 3:27 PM
> *To:* of Triumph Friends <fot at autox.team.net>
> *Subject:* [Fot] Collective wisdom
>
> Hello all,
>
> In an effort to constantly improve the car, I’ve been looking at the 
> cooling system on my TR4.  It currently has a header tank mounted to 
> the firewall that functions as the high spot in the system.  This tank 
> feeds the top of the radiator but doesn’t really circulate during 
> operation.  I’ve been thinking of plumbing the feed off of the back of 
> the head into the top of the tank so that it circulates.
>
> Normally this rear head feed is plumbed to the back of the water 
> pump.  In an exercise of overthinking, I’m not sure if there will be 
> sufficient circulation since the tank is plumbed to the radiator.  
> Does it matter?  What is the collective wisdom?
>
> Here are some pictures to help illustrate.
>
> Thanks,
>
> Chuck
>
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